A method for a treatment of a product web which is transported in an advance direction includes guiding the product web through a treatment gap which is formed by a first treatment roll being arranged in a first working position and a contour tool, providing a second roll, moving the second roll into a second working position in which the second roll forms a second treatment gap with the counter tool, and moving the first treatment roll into a first parked position in which the first treatment roll does not form a treatment gap with the counter tool.

A method for a treatment of a product web which is transported in an advance direction includes guiding the product web through a treatment gap which is formed by a first treatment roll being arranged in a first working position and a contour tool, providing a second roll, moving the second roll into a second working position in which the second roll forms a second treatment gap with the counter tool, and moving the first treatment roll into a first parked position in which the first treatment roll does not form a treatment gap with the counter tool.

Calender for treating web materials, comprising a structure for supporting two heated rollers forming a nip, wherein each roller has surface reliefs (RR) and in an operational setting of the calender the reliefs of one roller are radially opposed to those of the other roller, each roller rotates with a predetermined angular speed around its axis, the rollers are heated by heating means, and each roller undergoes an axial elongation as a consequence of its heating. The calender comprises detection means (E1, E2; IS) adapted to detect the axial elongation of each roller and a programmable control unit (UCP) connected to the detection means and to the heating means. The control unit is programmed to determine the difference between the axial elongations of the rollers and emitting an alarm signal if the absolute value of this difference is greater than a limit value.

A laminator comprises first and second rollers mounted in parallel for counter-rotation. One of the rollers is supported on a pair of pneumatic cylinders, which can be operated to adjust the gap between the rollers. When a desired gap is reached for the thickness of workpiece to be laminated, locks can be operated to prevent further movement of the first roller towards the second roller. Preferably the locks do not prevent movement of the first roller away from the second roller. After the locks have been engaged to protect the workpiece against crushing, the pressure applied to the first roller during the laminating process can be changed.

An information providing apparatus 10 according to one embodiment includes an acquisition unit 141, a calculation unit 142, and a providing unit 143. The acquisition unit 141 acquires a thickness measurement value of each of portions of paper and a moisture percentage measurement value of each of the portions of the paper before or after a pressing process of pressing each of the portions of the paper with a different pressing force by using a roll based on an index that is provided. The calculation unit 142 calculates an estimated value of a thickness of the paper after a moisture percentage of the paper has changed, based on the thickness measurement value and the moisture percentage measurement value. The providing unit 143 provides the estimated value as the index to an apparatus that performs the pressing process.